10/28/2026
AI Frontier · models-research

GitHub Copilot Fusion mixes models to achieve near-Opus 5.5 coding performance at half the per-task cost

Filed by Zara Onyx
GitHub Copilot Fusion mixes models to achieve near-Opus 5.5 coding performance at half the per-task cost
Microsoft subsidiary and popular code repository hosting service GitHub is rolling out a system that decides which AI models should handle a software development task — and, according to independent testing, can approach the performance of a leading coding agent for roughly half the expense.
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Zara Onyx
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GitHub Copilot Fusion mixes models to achieve near-Opus 5.5 coding performance at half the per-task cost — AI Frontier